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EP1476948A2 - Appareil pour la communication a bandes multiples - Google Patents

Appareil pour la communication a bandes multiples

Info

Publication number
EP1476948A2
EP1476948A2 EP03707706A EP03707706A EP1476948A2 EP 1476948 A2 EP1476948 A2 EP 1476948A2 EP 03707706 A EP03707706 A EP 03707706A EP 03707706 A EP03707706 A EP 03707706A EP 1476948 A2 EP1476948 A2 EP 1476948A2
Authority
EP
European Patent Office
Prior art keywords
frequency band
mobile communication
communication device
switch
coupled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03707706A
Other languages
German (de)
English (en)
Other versions
EP1476948A4 (fr
EP1476948B1 (fr
Inventor
Ross Lahlum
Randy Wiessner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Google Technology Holdings LLC
Original Assignee
Motorola Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola Inc filed Critical Motorola Inc
Publication of EP1476948A2 publication Critical patent/EP1476948A2/fr
Publication of EP1476948A4 publication Critical patent/EP1476948A4/fr
Application granted granted Critical
Publication of EP1476948B1 publication Critical patent/EP1476948B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40Circuits
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40Circuits
    • H04B1/403Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
    • H04B1/406Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40Circuits
    • H04B1/50Circuits using different frequencies for the two directions of communication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices
    • H04W88/06Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the present invention is directed to a method and apparatus for multiple band communication.
  • the present invention is directed to a mobile communication device that can access multiple systems simultaneously.
  • Compression of the transmission of downlink and uplink information in continuous receive and transmit communications systems can create time for monitoring other communication systems. During such compression, more data is transmitted over shorter time intervals to avoid a reduction in the data rate.
  • transmission compression requires more power, resulting in increased burdens on system capacity.
  • software to implement this compression may require more resources from the processor and memory, adding complexity to the design and also decreasing talk time.
  • any attempts at present multi-mode and multi-band wireless communications without compression require multiple antennas. Unfortunately, additional antennas increase the cost, size, and complexity of a portable communication device.
  • the invention provides a mobile communication device.
  • the mobile communication device can include an antenna configured to receive a first signal in a first frequency band and a second signal in a second frequency band, first receiver circuitry configured to receive signals in the first frequency band, a switch having a first position, and a first diplexing network coupled to the antenna, the first diplexing network also coupled to the switch, and first diplexing network also coupled to the first receiver circuitry.
  • the first diplexing network can be configured to pass signals in the first frequency band to the first receiver circuitry and to block signals in the second frequency band from the first receiver circuitry.
  • the first diplexing network can also be configured to pass signals in the second frequency band to the switch.
  • the mobile communication device can also include a second diplexing network coupled to the switch at the first position, the second diplexing network corresponding to the second frequency band.
  • Fig. 1 is an exemplary block diagram of a mobile communication device according to a first embodiment
  • Fig. 2 is an exemplary block diagram of a mobile communication device according to another embodiment
  • Fig. 3 is an exemplary illustration of controlling logic for a switch; and Fig. 4 is an exemplary illustration of a table showing examples of system selections and corresponding logic equations.
  • the mobile communication device 100 may be any type of wireless communication device, such as a mobile telephone, a mobile pager, or the like.
  • the mobile communication device 100 can include an antenna 110, a front end module 120, and input/output circuitry 140.
  • the antenna 110 may be internal or external to the mobile communication device 100. In operation, the antenna 110 sends and/or receives mobile communication signals in at least one frequency band.
  • the front end module 120 monitors another frequency band and can switch the mobile communication device into operation in the other frequency band depending on system availability in each frequency band.
  • the controller 140 controls the operation of the components of the mobile communication device 100.
  • the controller 140 can include a microprocessor, data memory, program memory, and/or control logic for implementing software and controlling the operation of the components of the mobile communication device 100.
  • the input/output circuitry 140 can act as a user interface for receiving and sending signals to the user of the mobile communication device 100.
  • the input/output circuitry 140 can send and/or receive audio, visual, or other sensory signals to a user.
  • the front end module 120 can be implemented on a multilayer low-temperature cofired ceramic (LTCC) module. This module 140 can provide band selection and filtering between EGSM, DCS, PCS, and WCDMA receive and transmit bands in third generation phones.
  • LTCC multilayer low-temperature cofired ceramic
  • Fig. 2 is an exemplary block diagram of a mobile communication device 200 according to another embodiment. All of the components aside from the antenna 210 of the mobile communication device 200 may comprise the front end module 120 of Fig. 1.
  • the mobile communication device 200 can include an antenna 210, a switch 220, diplexing networks 230, 232, 234, 236, and 238, filters 240, 242, 244, 246, 248, and 250, receiver circuitry or receivers 260, 262, 264, and 266, transmitter circuitry or transmitters 270, 272, and 274, and a controller 280.
  • the switch 220 can have up to and at least four positions 1, 2, 3, and 4 depending on the number of modes of operation and the number of different systems to be accessed by the mobile communication device 200.
  • the switch 220 may be a 4- position GaAs FET antenna switch. DC blocking capacitors may be used with the switch 220 to counteract any DC bias that may exist on the RF ports of the switch 220.
  • the antenna 210 may be internal or external to the mobile communication device 200. Also, the signal sent and/or received from the antenna 210 may be fed via a transmission line 285, through the diplexing network 230 and the transmission line 284 before reaching the switch 220.
  • the filters 240, and 242 may be ceramic filters or multilayer LC filters.
  • the filters 244, 246, and 250 may be SAW filters.
  • the filter 246 may be a multilayer LC filter.
  • the receiver 260 may be a WCDMA receiver.
  • the receiver 262 may be a GSM900 (or EGSM) receiver.
  • the receiver 264 may be a PCS receiver.
  • the receiver 266 may be a DCS receiver.
  • the transmitter 270 may be a WCDMA transmitter.
  • the transmitter 272 may be a DCS and a PCS transmitter.
  • the transmitter 274 may be a
  • the filters 240, 242, 244, 246, and 250 may be band pass filters.
  • the filter 248 may be a low pass filter.
  • the diplexing networks 230, 232, 234, 236, and 238 may comprise an LC circuit, an LC phase shift circuit, an LC resonating circuit, transmission lines, and the like.
  • the diplexing networks 230, 232, 234, 236, and 238 may also include a dedicated diplexer for diplexing signals in different frequency bands.
  • the lines connecting the various components of the mobile communication device 200 may include transmission lines 284-288. Additional transmission lines and filters may be inserted between the components to obtain various impedances for tuning the characteristics of the mobile communication device 200.
  • the mobile communication device 200 utilizes the out-of-band impedance of the components in each path together with appropriate phase shifts to rotate each path's impedance to an open at the relevant frequency.
  • the receiver 260 can actively monitor for the availability of a base station in a first frequency band while a call is in progress in any other band selected by the switch 220. Once the presence of a base station in the first frequency band is detected by the receiver 260, a handoff decision can be made by software in the controller 280 to switch to a system utilizing the base station in the first frequency band.
  • receivers, transmitters, diplexing networks, and filters for other systems may be substituted for those disclosed and those disclosed may be interchanged and rearranged to create different configurations for reception and transmission on different systems.
  • the mobile communication device 200 can operate in up to and at least four modes of operation. These modes include each of a first frequency band call mode, a second frequency band call mode, a third frequency band call mode, and a fourth frequency band call mode. These frequency band call modes can correspond to systems such as WCDMA, GSM900, PCS, DCS, and any other mobile communication systems.
  • the antenna 210 can send and/or receive signals in the various frequency bands.
  • the receiver 260 acts as a receiver for a first frequency band, such as WCDMA, which uses a full duplex call mode.
  • the diplexing network 230 acts as an open circuit to frequency bands other than a reception band in the first frequency band.
  • the filter 240 acts as a band pass filter for a reception band in the first frequency band and provides spurious response rejection.
  • the receiver 260 always monitors for a system in the first frequency band regardless of the current mode of operation and system used.
  • the switch 220 is at a first position 1.
  • Signals are transmitted in the first frequency band by the transmitter 270 and are received in the first frequency band by the receiver 260.
  • the transmitter 270 transmits signals in the first frequency band through the band pass filter 242.
  • the diplexing network 232 matches a path to a transmit band in the first frequency band and can act as an open circuit for a reception band in the first frequency band.
  • the diplexing network 232 can also act as an open circuit for other frequency bands.
  • the diplexing network 232 also diplexes signals in the first frequency band transmitted from the transmitter 270 with signals in the second frequency band received by the receiver 262.
  • the illustrated special diplexing arrangement is used.
  • the diplexing networks 230, 232, 234, 236, and 238 act in conjunction with the switch 220 so that, whichever path is selected, signals in a first frequency receive band will be presented with an open circuit after the switch 220. Signals in this band are then reflected back through the filter 240 to the first frequency receive band receiver 260.
  • signals received at the antenna 210 between 2110-2170 MHz will see any path through the switch 220 as an open circuit due to the characteristics of the diplexing networks 232, 234, 236, and 238.
  • WCDMA receive signals will only go through the diplexing network 230 and a WCDMA bandpass filter 240 to a WCDMA receiver 260.
  • the diplexing network 230 may be a network or simply a diplexing point picked off the transmission line 285 from the antenna 210 with a suitable phase shift from the filter 240 provided by the transmission line 284. Due to the out-of-band impedance of the filter 240, the phase rotation provided by the transmission line 284, and other related impedances, signals in other frequency bands will see the filter 240 as an open circuit, preventing them from reaching the WCDMA receiver 260.
  • the filter 240 may then have an out-of-band impedance characteristic in order for the diplexing arrangement to work properly. This impedance characteristic can be determined depending on impedances and phase shifting of all of the components of the mobile communication device 200. This characteristic may also be obtained from specifications relating to mobile communications devices.
  • transmission is done in a WCDMA transmission band between 1920- 1980 MHz at switch position 1.
  • Signals from the WCDMA transmitter 270 pass through a WCDMA transmission bandpass filter 242, then through the diplexing network 232 which isolates them from the filter 244 and receiver 262 while allowing them to pass to the antenna 210 when the switch 220 is in position 1.
  • the transmission line 286 provides a phase shift between networks inside the mobile communication device 200 or front end module 120 and the filter 242. This may represent the line length between the front end module 120 and the filter 242 and can be taken into account in the overall diplexing arrangement, along with the out-of-band impedance of the filter 242.
  • the filter 242 may have a controlled out-of-band impedance characteristic for optimal operation of the diplexing arrangement based on interaction with other components and established specifications for such systems.
  • the switch 220 alternates between the first position 1 and a fourth position 4 depending on whether the mobile communication device is receiving or transmitting.
  • Signals are transmitted in the second frequency band by the transmitter 274 and are received in the second frequency band by the receiver 262.
  • the transmitter 274 transmits signals in the first frequency band through the diplexing network 238.
  • the diplexing network 238 matches a path to a transmit band in the second frequency band and can act as an open circuit for a reception band in the second frequency band.
  • the diplexing network 238 can also act as an open circuit for other frequency bands.
  • the receiver 262 receives signals in a reception band in a second frequency band from the antenna 210 through the diplexing network 232 and the bandpass filter 244.
  • the diplexing network 232 matches a path to a reception band in the second frequency band and can act as an open circuit for other frequency bands.
  • reception is done for EGSM or GSM900 in a reception band between 925-960 MHz at switch position 1.
  • the diplexing network 232 also provides attenuation at the WCDMA transmission frequencies to protect the filter 244 from transmit power from the transmitter 270.
  • the diplexing network 232 also provides small isolation from transmit power when the switch is in position 3 or position 4 if the switch isolation alone is insufficient to protect the filter 244.
  • transmission is done for EGSM in a transmission band between 880-915 MHz at switch position 4.
  • Signals from the EGSM transmitter 274 pass through the diplexing network 238, which protects the DCS receiver filter 250 from transmit power while allowing the EGSM transmission signal to pass to the antenna when the switch 220 is in the fourth position.
  • a EGSM harmonic filter may also be used separately, or the function may be performed by a stopband characteristic of the diplexing network 238.
  • the transmission line 288 represents the transmission line length between the EGSM transmitter 274 and a EGSM transmit pin on the front end module 120.
  • the switch 220 alternates between the second position 2 and a third position 3 depending on whether the mobile communication device is receiving or transmitting.
  • Signals are transmitted in the third frequency band by the transmitter 272 and are received in the third frequency band by the receiver 264.
  • the transmitter 272 transmits signals in the third frequency band through the low pass filter 248 and the diplexing network 236.
  • the diplexing network 236 matches a path to a transmit band in the third frequency band and can act as an open circuit for other frequency bands.
  • the receiver 264 receives signals in a reception band in a third frequency band from the antenna 210 through the diplexing network 234 and the bandpass filter 246.
  • the diplexing network 234 matches a path to a reception band in the third frequency band and can act as an open circuit for other frequency bands.
  • reception is done in a PCS reception band between 1930-1990 MHz at switch position 2.
  • the switch 220 With the switch 220 at position 2, signals arriving at the antenna 210 in the PCS receive band pass through diplexing network 234 to the PCS receiver filter 246.
  • This position of the switch is not duplexed with a transmit path, so the network may be simpler than others. Like the other receive paths, however, sufficient attenuation at the other transmit frequencies is needed to protect the filter 246 from transmit power unless switch isolation is adequate.
  • the switch 220 alternates between the fourth position 4 and a third position 3 depending on whether the mobile communication device is receiving or transmitting.
  • Signals are transmitted in the fourth frequency band by the transmitter 272 and are received in the fourth frequency band by the receiver 266.
  • the transmitter 272 transmits signals in the fourth frequency band through the diplexing network 236.
  • the diplexing network 236 matches a path to a transmit band in the fourth frequency band and can act as an open circuit for other frequency bands.
  • the receiver 266 receives signals in a reception band in a fourth frequency band from the antenna 210 through the diplexing network 238 and the bandpass filter 250.
  • the diplexing network 238 matches a path to a reception band in the fourth frequency band and can act as an open circuit for other frequency bands.
  • the diplexing network 238 also diplexes signals in the second frequency band transmitted from the transmitter 274 with signals in the fourth frequency band received by the receiver 266.
  • reception is done in the DCS receive band between 1805-1880 MHz at switch position 4. With the switch at position 4, signals arriving at the antenna 210 in the DCS receive band pass through the diplexing network 238 to the DCS filter 250.
  • the diplexing network 238 also provides attenuation to protect the filter 250 from EGSM transmit power from the transmitter 274.
  • transmission is done in DCS and PCS transmission bands between, respectively, 1710-1785 MHz and 1850-1910 MHz at switch position 3.
  • the filter 248 may be a low pass filter, a transmit harmonic filter, a notch filter, or the like.
  • required harmonic attenuation of the transmitter 272 may also be provided by a stopband characteristic of the diplexing network 236.
  • the filter 248 can attenuate thermal noise in the WCDMA receiver band coming from the DCS/PCS transmitter 272 and forms part of the overall diplexing network along with a phase shift provided by the transmission line 287. This attenuation protects the WCDMA receiver 260 from desense while transmitter 272 is operating. As with the WCDMA receive and transmit bandpass filters 240 and 242, the transmission line out- of-band impedance should be controlled for the proper operation of the diplexing arrangement which may be determined from system specifications.
  • Fig. 3 is an exemplary illustration of controlling logic 300 for the switch 220.
  • Logic inputs A, C, D, E, F, and G correspond to mobile communication device signals utilized by the controller 280.
  • Outputs , 1, 3, and 4 correspond to signals indicating switch position to the switch 220.
  • Fig. 4 is an exemplary illustration of a table 400 showing examples of system selections, switch positions, voltage references, and corresponding logic equations for operation of the controlling logic 300.
  • This controlling logic 300 provides level shifting as well as decoding to provide the GaAs switch 220 with adequate gate voltage to maintain linearity. Level shifting also provides a means to accommodate different chipset logic levels at the GaAs switch.
  • Controlling logic 300 may be performed by any suitable logic as known in the art. Modifications of the signals and logic of controlling logic 300 is necessary depending on the actual systems and applications of the front end module 120. For example, different signals and controlling logic 300 may be used for implementing the front end module 120 in different mobile communication devices and on different systems.
  • the controller 280 of Fig. 2 can control the operation of the mobile communication device 200.
  • the controller 280 can include similar components and operate in a similar manner to the controller 130 of Fig. 1.
  • the controller 280 may include the switch decoder logic 300 or the switch decoder logic 300 may be implemented on an ASIC in the same package as the GaAs switch 220. Switch control inputs may be driven with a sufficiently high voltage to achieve a desired linearity. Any level shifting required to match voltage requirements may be performed on the ASIC along with decoding. Controlling signals for the decoding logic may be provided by standard IC's utilized with a standard mobile communication device which may be implemented within the controller 280. Any useful logic circuits may be implemented for decoding controller control signals for switching the switch 220 as is known in the art.
  • the controller operations of this invention are preferably implemented on a programmed processor. However, the controller operations may also be implemented on a general purpose or special purpose computer, a programmed microprocessor or microcontroller and peripheral integrated circuit elements, an ASIC or other integrated circuit, a hardware electronic or logic circuit such as a discrete element circuit, a programmable logic device such as a PLD, PLA, FPGA or PAL, or the like. In general, any device on which resides a finite state machine capable of implementing the controller operations may be used to implement the processor functions of this invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)

Abstract

L'invention concerne un dispositif de communication mobile (200) comprenant une antenne (210) configurée pour envoyer et/ou recevoir un premier signal dans une première bande de fréquences et un second signal dans une seconde bande de fréquences, un premier circuit de récepteur (260) conçu pour recevoir des signaux dans la première bande de fréquences, un commutateur (220) présentant une première position et un premier réseau de diplexage (230) couplé à l'antenne, ledit premier réseau de diplexage étant également couplé au commutateur et au premier circuit de récepteur. Ce premier réseau de diplexage peut être configuré pour acheminer des signaux dans la première bande de fréquences vers le premier circuit de récepteur et pour bloquer des signaux dans la seconde bande de fréquences provenant du premier circuit du récepteur. Ledit premier réseau de diplexage peut également être conçu pour acheminer des signaux dans la seconde bande de fréquences vers le commutateur. Ce dispositif de communication mobile peut aussi comporter un second réseau de diplexage (232) couplé au commutateur à la première position, le second réseau de diplexage (232) correspondant à la seconde bande de fréquences.
EP03707706.2A 2002-02-13 2003-02-04 Appareil pour la communication a bandes multiples Expired - Lifetime EP1476948B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/074,969 US6912406B2 (en) 2002-02-13 2002-02-13 Apparatus for multiple band communication
US74969 2002-02-13
PCT/US2003/003345 WO2003069786A2 (fr) 2002-02-13 2003-02-04 Appareil pour la communication a bandes multiples

Publications (3)

Publication Number Publication Date
EP1476948A2 true EP1476948A2 (fr) 2004-11-17
EP1476948A4 EP1476948A4 (fr) 2011-02-02
EP1476948B1 EP1476948B1 (fr) 2017-11-08

Family

ID=27659998

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03707706.2A Expired - Lifetime EP1476948B1 (fr) 2002-02-13 2003-02-04 Appareil pour la communication a bandes multiples

Country Status (7)

Country Link
US (1) US6912406B2 (fr)
EP (1) EP1476948B1 (fr)
KR (1) KR100701108B1 (fr)
CN (1) CN101015126B (fr)
AU (1) AU2003208981A1 (fr)
BR (1) BRPI0307377B1 (fr)
WO (1) WO2003069786A2 (fr)

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Also Published As

Publication number Publication date
WO2003069786A2 (fr) 2003-08-21
CN101015126B (zh) 2010-07-14
EP1476948A4 (fr) 2011-02-02
EP1476948B1 (fr) 2017-11-08
CN101015126A (zh) 2007-08-08
KR100701108B1 (ko) 2007-03-29
BR0307377A (pt) 2004-12-07
US20030153348A1 (en) 2003-08-14
US6912406B2 (en) 2005-06-28
KR20040080000A (ko) 2004-09-16
AU2003208981A8 (en) 2003-09-04
WO2003069786A3 (fr) 2004-04-01
AU2003208981A1 (en) 2003-09-04
BRPI0307377B1 (pt) 2019-10-01

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